I feel horrible

From 2010-2012 my husband and I put on a lot of weight and were extremely unhealthy and over weight. We both decided to make a change and lost all of the weight and were extremely healthy. Around the time of our wedding from December 2015-now we fell off of the healthy kick and are nearly back into all of old ways. He gained 50lbs, I just feel sick internally but haven't gained weight (maybe my metabolism is better than before) but, I just hate seeing him so sad because he worked so hard to drop the weight. He's making changes again and so am I. It's just hard when you see your husband down on himself :/
Anyone have advice on quick weight loss?